KEnergy[Tenaga]Outside of cell[Luarsel]Inside of cell[Dalamsel]Movement of substances into the cell[Pergerakanbahankedalamsel]LM1Diagram 1 shows the structure of plasma membrane based on the fluid mosaic model.Rajah 1 menunjukkanstrukturmembran plasma berdasarkan model mozek-bendalir.

Diagram 1Rajah 1

(a)Name the parts labelled as K, L, and M.NamakanbahagianberlabelK, LdanM.K : ....................L : ...............M : ..... [2 marks]

1(a)

(b)(i)Explain the structure of K.TerangkanstrukturK.............[2 marks]

1(b)(i)

(ii)Name one substance that is able to move across part K. Explain the characteristic of the substance related to this ability.Namasatubahan yang bolehmerentasbahagianK. Terangkanciribahanitu yang berkaitandengankebolehannyaini..............[2 marks]

(b)(ii)

(c)The following substances are on the outside of the cell body.Bahan-bahanberikutterdapatdi bahagianluarsatuselbadan.

Oxygen Amino acids Glucose oksigenasid aminoglukosa

(i)Explain how oxygen is transported into the cell.Terangkanbagaimanaoksigendiangkutkedalam sel. .................. .....[2 marks]

1(c)(i)

(ii)Glucose and amino acids enter the cell at specific sites in the plasma membrane. Explain why.Glukosadanasid amino memasukiselmelaluitapakaktifpadamembran plasma. Terangkanmengapa?.................. .....[2 marks]

1(c)(ii)

(d)Diagram 2Rajah 2

Diagram 2 shows a type of herbicide was sprayed on the weed plants to control their population. The herbicide causes the proteins and ATPase enzyme in the cell to denature. Explain the effect of this herbicide to the transport of potassium ions in the weed plants.Rajah menunjukkansejenisracunrumpaidisemburkeatastumbuhanrumpaiuntukmengawalpopulasitumbuhanitu. Racunrumpaiitumenyebabkan protein danenzim ATPase di dalamrumpaiituternyahasli.Terangkankesanracunrumpaiinikeataspengangkutan ion-ion kaliumdalamtumbuhanrumpaiini........................... ..............[3 marks]

1 (d)